add searchpath and searchpath2

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 55 insertions, 0 deletions

diff --git a/src/unistd/searchpath.c b/src/unistd/searchpath.c
new file mode 100644
index 0000000..84bc58e
--- /dev/null
+++ b/src/unistd/searchpath.c
@@ -0,0 +1,55 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <unistd.h>
+
+
+
+/**
+ * Search the environment variable $PATH for an executable
+ * file whose name is the specified name. Slashes are ignored
+ * and treated as any other character. $PATH is searched
+ * for left to right, and ':' is used as the path-delimiter.
+ * 
+ * $PATH is not inspected if `name` starts with './', '../', or '/'.
+ * 
+ * This is a Plan 9 from Bell Labs compliant slibc extension.
+ * 
+ * @etymology  (Search) ($PATH) for an executable.
+ * 
+ * @param   name  The name of the sought executable.
+ * @return        The pathname of the sought file, `NULL` on error,
+ *                or if not found. Files that are not executable
+ *                are (almost) ignored.
+ * 
+ * @throws  ENOMEM  The process cannot allocate enough memory.
+ * @throws  ENOENT  $PATH is not defined, there are no directories
+ *                  listed in $PATH, or the sought file is not
+ *                  exist inside $PATH.
+ * @throws  EACCES  None of the candidates (with at least one candidate)
+ *                  are executable by the current user.
+ * @throws          Any exception defined for access(3), except for `EROFS`,
+ *                  these when encountered, the search is aborted, unless
+ *                  the error is `ENOENT` or `EACCES`.
+ * 
+ * @since  Always.
+ */
+char* searchpath(const char* name)
+{
+  return searchpath2(name, "");
+}
+